Seldaek/monolog · error · UnexpectedValueException

The nested handler of type {class} does not support formatte

Error message

The nested handler of type {class} does not support formatters.

What it means

Error "The nested handler of type {class} does not support formatters." thrown in Seldaek/monolog.

Source

Thrown at src/Monolog/Handler/OverflowHandler.php:125

        }

        $this->handler->handle($record);

        return false === $this->bubble;
    }

    /**
     * @inheritDoc
     */
    public function setFormatter(FormatterInterface $formatter): HandlerInterface
    {
        if ($this->handler instanceof FormattableHandlerInterface) {
            $this->handler->setFormatter($formatter);

            return $this;
        }

        throw new \UnexpectedValueException('The nested handler of type '.\get_class($this->handler).' does not support formatters.');
    }

    /**
     * @inheritDoc
     */
    public function getFormatter(): FormatterInterface
    {
        if ($this->handler instanceof FormattableHandlerInterface) {
            return $this->handler->getFormatter();
        }

        throw new \UnexpectedValueException('The nested handler of type '.\get_class($this->handler).' does not support formatters.');
    }
}

View on GitHub (pinned to 57eb102834)

When it happens

Trigger: Thrown at src/Monolog/Handler/OverflowHandler.php:125 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Seldaek/monolog@57eb102834 (2026-08-17). Data as JSON: /api/errors/661f66ca222a6268. Report an issue: GitHub.